In the UK, there are these things called ransom strips, a very thin (maybe just a few inches) but long strip of land that is used to control and interfere with

In the UK, there are these things called ransom strips, a very thin (maybe just a few inches) but long strip of land that is used to control and interfere with other people's access to their own land. It could be there are some downsides to having a continuous strip/barrier running all the way across the ocean floor. Maybe some sea creature's migration is disturbed/impeded by it - who knows. I'd be more inclined to think there could indeed be some impact than to just say "no worries, it's only a cable, no big deal on the scale of the oceans".